// if-else

#include <stdio.h>

int main(int argc, char const *argv[])
{
    // init
    int price = 0;
    int bill = 0;
    
    // get price and bill
    printf("Input price: ");
    scanf("%d", &price);
    printf("Input bill: ");
    scanf("%d", &bill);

    // calculate change
    if ( bill > price )
    {
        printf("I should give you %d\n", bill - price);
    }
    else if ( bill == price )
        // 只有一行内容时，也可以不加大括号
        printf("Exactly\n");
    else
    {
        printf("U fucking LowB! Give me %d more\n", price - bill);
    }

    return 0;
}